Realtime tracking

Introduced in GPSBabel 1.3.1, we now have an experimental feature for realtime tracking via the new -T option. This reads position reports from selected formats and writes an output file when a position report is received.

As of this writing, Garmin's PVT
protocol and
NMEA are supported
inputs. KML, NMEA, and the various XCSV formats are supported on
output. Additional formats may be added by interested parties
later.

Will read the Wintec WBT-201 via Bluetooth, using the name that
the Mac assigned it, and rewrite 'xxx.kml' atomically,
suitable for a self-refreshing network link in Google Earth.

Be sure to substitute an device name appropriate for your device
and OS, such as /dev/cu.usbserial or
/dev/cu.BT-GPS-37A695-BT-GPSCOM-1
for Mac, COM23: for Windows, or
usb: for
Garmin USB. These names
(except the "usb:" parlance for Garmin USB) are assigned by
your operating system.